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Senin, 02 Juni 2014
Telephone Ringer Visual Alert (LED)
I have a T-mobile@home analog phone by my desk and there are times when I want to turn off the ringer and use a visual alert instead so I designed a circuit to flash an LED when the phone rings. The circuit consists of a 1N4003 diode in series with an 8K resistor and a white LED. I used leftover/re...